Angle Sensor Condition Determination via Signal Correction
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Solution Overview
Problem
Existing angle sensors face challenges in accurately determining their condition due to variations in detection signals caused by factors like magnetic anisotropy and manufacturing inaccuracies, leading to incorrect failure detection and reduced accuracy in determining the sensor's operational state.
Innovation Solution
A condition determination apparatus that generates initial determination values from detection signals and performs correction processing to reduce variation components, allowing for accurate determination of the sensor's condition by distinguishing between ideal and error components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If determination values are generated by performing operations using detection signals from an angle sensor, then failure detection capability is provided, but the determination values vary depending on physical quantities like angle to be detected, leading to reduced determination accuracy
Solution Approach 1:
The determination value is segmented into two distinct components: an ideal value component (first determination value) that remains constant when the angle sensor is normal, and a variation component (second determination value) that changes with the angle to be detected. This segmentation allows the system to distinguish between normal operational variations and actual failures, resolving the contradiction between providing failure detection capability and maintaining determination accuracy.
2Adaptability or versatility
If the angle sensor operates with detection signals that may be distorted from sinusoidal curves due to magnetic anisotropy or manufacturing variations, then the sensor can function in practical conditions, but the determination values deviate from ideal constant values, reducing failure detection accuracy
Solution Approach 1:
A correction value is introduced as an intermediary element to bridge the gap between the ideal determination value and the actual determination value affected by distortion. The correction value, calculated based on the detected angle and stored correction data, compensates for the effects of magnetic anisotropy and manufacturing variations, allowing the angle sensor to maintain functionality under practical conditions while restoring determination accuracy.
3Measurement precision
If correction values are calculated and stored for each angle to compensate for determination value variations, then determination accuracy is improved, but device complexity and memory requirements increase
Solution Approach 1:
The correction values are stored in a lookup table indexed by the detected angle parameter. When determination is needed, the system retrieves the appropriate correction value based on the current angle parameter rather than performing complex real-time calculations. This approach maintains high determination accuracy while significantly reducing device complexity and computational burden.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The apparatus enables precise determination of the angle sensor's condition, reducing false positives and improving accuracy in detecting failures, thereby ensuring reliable operation.
Implementation Method 1
Each of the plurality of magnetic detection elements includes, for example, a spin-valve magnetoresistance (MR) element
Implementation Method 2
a magnetization pinned layer whose magnetization direction is pinned
Implementation Method 3
a free layer whose magnetization direction varies depending on the direction of the rotating magnetic field
Data Source
AI summary
An angle sensor includes a detection signal generation unit, an angle detection unit for generating a detected angle value by performing an operation using detection signals, and a condition determination apparatus. The condition determination apparatus includes an initial determination value generation unit, correction processing unit and determination unit. The initial determination value generation unit performs an operation using the detection signals to generate an initial determination value corresponding to the angle sensor condition. The correction processing unit performs correction processing on the initial determination value to generate a corrected determination value. The determination unit determines whether the angle sensor is in a normal condition on the corrected determination value basis. The initial determination value contains a variation component which varies depending on an angle to be detected. The correction processing is processing for allowing the corrected determination value to be lower in variation component than the initial determination value.